iMac G5 DVD Problems

[Ryan Downey]

Hardware Overview:

Machine Name: iMac G5
Machine Model: PowerMac12,1
CPU Type: PowerPC G5 (3.1)
Number Of CPUs: 1
CPU Speed: 2.1 GHz
L2 Cache (per CPU): 512 KB
Memory: 1.5 GB
Bus Speed: 700 MHz
Boot ROM Version: 5.2.6f1

I am having trouble with commercial DVD's. They used to work fine but now when I insert the DVD i get a black screen in the DVD player window and the time tracks forward in real-time with no images. No navugation is possible other than "stop". Any idea out there?

Additionally. I recently replaced a faulty superdrive on my 867 Mhz powerbook G4 with the Matshita UJ-845S. The work was done by an authorized service shop. Commervial DVD's are not recognized at all. I have tried patchburn with no success. Any experts out tthere?

Regards,

Ryan